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H. E. CURTIS;

TYPE WRITING MACHINE.

N0. 446,432. Patented Feb. 17; 1891;

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TYPE-WRITING MACl-HNE.

SPECIFICATION forming part of Letters Patent No. 446,432, dated February17, 1891. Application filed June 4:, 1888. Serial No. 275,973. (Nomodel.)

To all whom, it may concern: I

Be it known that I, HENRY E. OUR'rIs, a citizen of the United States,residing at Springfield, in the county of llampden and State ofMassachusetts, have invented certain new and useful Improvements in'lype-lVriting Machines, of which the following is a full, clear, and.exact description, reference being had to the accompanying drawings,which form part of this specification.

Previous to my invention the key-levers of type-writing machines havebeen arranged in a variety of ways, so as to act as lovers of the secondor third order. In machines in which the key-levers are of the secondand thirdorders the connecting-rod is attached to the type bar orcarrier in rear of its fulcrum and is pulled down at each depression ofthe finger-key. The objection to machines'having key-levers of thesecond and third orders is that the levers are of different lengths, (orthe finger-keys located at differentdistances from the fulcra of thelevers,) and hence have a varying extent of depression and requiredifferent applications of power to elevate the type-bars, according tothe bank of keys being operated upon. The objection to the use of akey-leverof the third order is greater than that to a lover of thesecond order, for the reason that more power isrequired to operate theformer than the latter kind of lever.

My invention has for its main object to so arrange key-levers of thesecond and third orders that the depression of each finger-key may beexactly the same and so that the muscular power required to operate onekey may be precisely the same as that required to operate any other keyon the key-board of the machine.

To these main ends and obj ccts my invention consists in the combinationof parts hereinafter more fully described, and particularly pointed outin the appended claims.

In the accompanying drawings, Figure 1 is a longitudinal verticalsection of a type-writing machine involving my invention. Fig. 2 is aperspective skeleton view to better show the construction andarrangement of the parts embodying my improvement. Fig. 3 is a skeletonplan View to show the arrangement of two sets of lovers for differentbanks of keys. Fig. 4 is a vertical section, taken at the line Ll, ofFig. 2; and Fig. 5 is a similar View taken at the line y g of the samefigure.

In the several views the same part will be found designated by the sameletter or numeral of reference.

A is the bed-plate or base of the machine, upon which posts B B aresecured to support the usually-employed type-ring or top-plate O.

D is the carriage, containing a cylindrical platen E.

2 represents a type bar or carrier, which is pivoted or fulcrumed at 3in a hanger or support and is attached at its rear end t to the upperend of a vertically-arranged connecting-rod 5.

6 represents a lever, which is hinged or fulcrumed at one end on acrossbar 7 at the front of the machine. The opposite end of said leveris connected to the lower end of the connecting-rod 5, preferablyloosely and simply by resting upon a small anti-friction roller 8,journaled in the bifurcated extremity of said connecting-rod.

9 represents another lever, which is pivoted or f ulcru med at one endon another cross-bar 10, located back of the key-board of the machine.The front end of the lever 9 is connected to a forked or slotted socket11, which bears at its upper end a finger-key button 12. Between theirfulcrums the two levers 6 and 9 are connected by a link 13, preferablypivoted at each end and preferably made of two separate bars and appliedone on each side of the levers.

The levers 6 and 9 of each set stand in the same vertical plane and thelevers 6 all pass through the slots 14: in the finger-key sockets andare prevented thereby from having lateral movement. The slots 1% areelongated to permit the requisite depression of the finger-keys, theupper end or stems of which pass through perforations in the cross-bars15 of the key-board frame, and are thus guided in their movements up anddown. The upper ends of the finger-key sockets operate throughguide-holes in the bed-plate or base A. It will be observed that theupper lever 6, which is connected to the connecting-rod 5, is alever ofthe third order, and that the lower lever 9, to which the finger-key isconnected, is a le-= ver of the second order, and that these lovers arejoined by the link 13 to operate simultaneously at each stroke of thefinger-key.

In operation the finger-key is depressed and the free end of theleverf)vibrated downwardly. During the descent of the lever 9 the link 13,moving therewith, pulls down the free end of the lever (S, which in turnearriesalong the connecting-rod 5, and the latter, beingattached to therear end of the type-lever, throws upwardly its lower type end to effectthe printing of the paper upon the platen. On releasing the pressureupon the finger-key the parts all return to their normal position, aspring, suitably arranged, being provided for this purpose. The saidspring may be located under the finger-key or under either key-1ever; orthe spring of the universal bar (not shown) may be employed forreturning the parts to the first position.

1t will be understood that in practice the transverse fulcrum-rods 7 and10 extend entirely across the machine and support, respectively, all thekey-levers 6 and 9.

By the combination of the levers 6 and 9 I am enabled to produce atype-wri tin g machine in which the depression of all the keys may bemade uniform, and in which the power to be exerted for one key is thesame as that for another.

Having now so fully described my invention that those skilled in the artmay make and use the same, what I claim as new, and desire to secure byLetters Patent, is-

1. In a type-Writing machine, the key-lever 6, pivoted below and at thefront of the keyboard, the key-lever 9, pivoted below the lever 6 and atthe rear of the key-board, the connecting-link 13 uniting saidleversbetween their pivots or fulcrums, a finger-key connected to the lever 9,atype-carrier, and arod connecting the type-carrier with the lever (3,as set forth.

2. In a type-writing machine, the combination of the transversefulcrum-rods 7 and 10, the levers 6 and 9 thereon and pointing inopposite directions, the link 13, connecting apair of said levers, thetype-carriers, aconnectingrod joining one of the type-carriers with oneof the levers 6, and a finger-key for each of the levers 9, as setforth.

In a type-writing machine, the combination of the transverse rods 7 and10, the le vers b and 9, the link 13, the slotted fingerkey support, theconnecting-rod, and the typebar, substantially as and for the purposeset forth.

Signed at Springfield, in the county of Ilampden and State ofMassachusetts, this 16th day of November, 1887.

II. E. CURTIS.

In presence of- JACOB FELBEL,

ANDREW W. STEIGER.

